5x-[-x平方-(x+2)]如何化简

问题描述:

5x-[-x平方-(x+2)]如何化简

5x-[-x²-(x+2)]
=5x-(-x²-x-2)
=5x+x²+x+2
=x²+6x+2
=(x+3)²-7

5x-[-x平方-(x+2)]

=5x-(-x平方-x-2)
=5x+x平方+x+2
=6x+x平方+2

5x-[-x²-(x+2)]
=5x-(-x²-x-2)
=5x+x²+x+2
=x²+6x+2